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SeqInstances.scala
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SeqInstances.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats.kernel
package instances
import compat.scalaVersionSpecific._
import scala.annotation.nowarn
import scala.collection.immutable.Seq
@suppressUnusedImportWarningForScalaVersionSpecific
trait SeqInstances extends SeqInstances1 {
implicit def catsKernelStdOrderForSeq[A: Order]: Order[Seq[A]] =
new SeqOrder[A]
implicit def catsKernelStdMonoidForSeq[A]: Monoid[Seq[A]] =
SeqMonoid[A]
}
private[instances] trait SeqInstances1 extends SeqInstances2 {
implicit def catsKernelStdPartialOrderForSeq[A: PartialOrder]: PartialOrder[Seq[A]] =
new SeqPartialOrder[A]
implicit def catsKernelStdHashForSeq[A: Hash]: Hash[Seq[A]] =
new SeqHash[A]
}
private[instances] trait SeqInstances2 {
implicit def catsKernelStdEqForSeq[A: Eq]: Eq[Seq[A]] =
new SeqEq[A]
}
class SeqOrder[A](implicit ev: Order[A]) extends Order[Seq[A]] {
def compare(xs: Seq[A], ys: Seq[A]): Int =
if (xs eq ys) 0
else StaticMethods.iteratorCompare(xs.iterator, ys.iterator)
}
class SeqPartialOrder[A](implicit ev: PartialOrder[A]) extends PartialOrder[Seq[A]] {
def partialCompare(xs: Seq[A], ys: Seq[A]): Double =
if (xs eq ys) 0.0
else StaticMethods.iteratorPartialCompare(xs.iterator, ys.iterator)
}
class SeqHash[A](implicit ev: Hash[A]) extends SeqEq[A] with Hash[Seq[A]] {
def hash(xs: Seq[A]): Int = StaticMethods.orderedHash(xs)
}
class SeqEq[A](implicit ev: Eq[A]) extends Eq[Seq[A]] {
def eqv(xs: Seq[A], ys: Seq[A]): Boolean =
if (xs eq ys) true
else StaticMethods.iteratorEq(xs.iterator, ys.iterator)
}
@deprecated("Use SeqMonoid.apply, which does not allocate a new instance", "2.9.0")
class SeqMonoid[A] extends Monoid[Seq[A]] {
def empty: Seq[A] = Seq.empty
def combine(x: Seq[A], y: Seq[A]): Seq[A] = x ++ y
override def combineN(x: Seq[A], n: Int): Seq[A] =
StaticMethods.combineNIterable(Seq.newBuilder[A], x, n)
override def combineAll(xs: IterableOnce[Seq[A]]): Seq[A] =
StaticMethods.combineAllIterable(Seq.newBuilder[A], xs)
}
object SeqMonoid {
@nowarn("msg=deprecated")
private[this] val singleton: Monoid[Seq[Any]] = new SeqMonoid[Any]
def apply[A]: SeqMonoid[A] = singleton.asInstanceOf[SeqMonoid[A]]
}